#include <iostream>
using namespace std;
void add(int a, int b) {
  cout << a + b << endl;
}
void sub(int a, int b) {
  cout << a - b << endl;
}
void mul(int a, int b) {
  cout << a * b << endl;
}
void divid(int a, int b) {
  if (b == 0)
    cout << "Divided by zero!" << endl;
  else
    cout << a / b << endl;
}
void invalid(int a, int b) {
  cout << "Invalid operator!" << endl;
}
int main() {
  int a, b;
  char c;
  cin >> a >> b >> c;
  void (*op)(int, int) = nullptr;
  if (c == '+') op = add;
  else if (c == '-') op = sub;
  else if (c == '*') op = mul;
  else if (c == '/') op = divid;
  else op = invalid;
  op(a, b);
}